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Dec28-03, 04:57 PM
Sci Advisor
krab's Avatar
P: 905
Most motorcycle alternators have no brushes. There is a stator field coil held in place from one side, a steel rotor comprised of 2 halves with a zigzag separation cantilevered in from the other side, and pickup coils on the outside. It works the same as an automotive unit except that since it only has a bearing on one side, the field coil can come in from the other and needs not rotate. In the automotive unit, there are bearings on both sides so slip rings and brushes are needed to activate the field coil.